water star grass vs mud plantain

water star grass and mud plantain both are nouns.

Word	Noun	Adjective	Verb	Adverb
water star grass	Yes	No	No	No
mud plantain	Yes	No	No	No

As nouns, water star grass and mud plantain are synonyms defined as:

water star grass and mud plantain: grassy-leaved North American aquatic plant with yellow star-shaped blossoms

Other synonyms of water star grass include Heteranthera dubia.

water star grass (noun)	mud plantain (noun)
grassy-leaved North American aquatic plant with yellow star-shaped blossoms	grassy-leaved North American aquatic plant with yellow star-shaped blossoms